Number of players: Any
Restrictions: No human speaking
Duration: Any
Order: Alternately

(1) A stone or another thing inside or close to the water emits a call to the human player.
(2) The human player places, replaces or removes the thing into, within or out of the running water.
(3) The water responds to the action by changing its sonic expression.

Players: alnus viridis, andrea caretto, bertula alba, fagus sylvatica, garnet micaschist, laura harrington, ludwig berger, micaschist, micaschist eclogite, monzonite, petasites sp., pteridium, aquilinum, sara cattin, sèssera water, sod, syenite.